maintenance CADILLAC CT4 2023 Service Manual

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Service and Maintenance 475
Maintenance Replacement Parts
Replacement parts identified below by name, part number, or specification can be obtained from
your dealer.Part GM Part NumberACDelco
Part Number
Engine Air Cleaner/Filter
I2.0L L4 Engine 84498926 A3245C
I2.7L L4 Engine 84498926 A3245C
I3.6L V6 Engine (Driver Side) 84335354 A3235C
I3.6L V6 Engine (Passenger Side) 84335354 A3235C
Engine Oil Filter I2.0L L4 engine 55495105 PF66
I2.7L L4 engine 55495105 PF66
I3.6L V6 Engine 12707246 PF63
Passenger Compartment Air Filter IStandard Filter 84987523 CF185
IFine Dust Particulate 23195727 CF206
Spark Plugs I2.0L L4 engine 55504354 41–103–IP
I2.7L L4 engine 12688094 41–106–IP
I3.6L V6 Engine 12662396 41–147

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
476 Service and Maintenance
PartGM Part NumberACDelco
Part Number
Wiper Blades
IDriver Side –55 cm (22 in) 84613732
—
IPassenger Side –45 cm (18 in) 84574892
—

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
Service and Maintenance 477
Maintenance Records
After the scheduled services are performed, record the date, odometer reading, who performed
the service, and the type of services performed in the boxes provided. Retain all maintenance
receipts.Date Odometer
Reading Serviced By Maintenance
Stamp Services Performed

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/5/22
486 Customer Information
United States and
Puerto Rico
Cadillac Customer Assistance
Center
Cadillac Motor Car Division
P.O. Box 33169
Detroit, MI 48232-5169
1-800-458-8006
1-800-833-2622 (For Text
Telephone devices (TTYs))
Roadside Assistance:
1-800-224-1400
From U.S. Virgin Islands:
1-800-496-9994
Canada
Cadillac Customer Care
Centre
General Motors of Canada
Company
500 Wentworth Street W
Oshawa, ON L1J 0C5
1-888-446-2000 (English/
French)
Cadillac Roadside Assistance:
1-800-882-1112
Overseas
Contact the local General
Motors Business Unit.
Customer Assistance
for Text Telephone
(TTY) Users
To assist customers who are
deaf, hard of hearing,
or speech-impaired and who
use Text Telephones (TTYs),
Cadillac has TTY equipment
available at its Customer
Assistance Center. Any TTY
user can communicate with
Cadillac by dialing:
1-800-833-2622. TTY users in
Canada can dial
1-800-263-3830.
Online Account
Create a Cadillac Account
(U.S.) at cadillac.com
Learn more about your vehicle
features, shop for and manage
your connected services andOnStar plans, and access
diagnostic information specific
to your vehicle.
Membership Benefits
E:
Download owner’s
manuals and view
vehicle-specific how-to videos.
G: View maintenance
schedules, alerts, and Vehicle
Diagnostic Information.
Schedule service
appointments.
I: View service records from
your dealership and add
your own.
D: Select a dealer and view
locations, maps, phone
numbers, and hours.
r: Track your vehicle’s
warranty information.
J: View active recalls or
search by Vehicle
Identification Number (VIN).

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/5/22
494 Customer Information
company. In such cases, you
can have control of the repair
and parts choices as long as
the cost stays within
reasonable limits.
Publication Ordering
Information
Service Manuals
Service manuals have the
diagnosis and repair
information on the engine/
propulsion, transmission, axle,
suspension, brakes, electrical
system, steering system,
body, etc.
Customer Literature
Owner’s manuals are written
specifically for owners and are
intended to provide basic
operational information about
the vehicle. The owner’s
manual includes the
Maintenance Schedule for all
models.Customer literature
publications available for
purchase include owner’s
manuals, warranty manuals,
and portfolios. Portfolios
include an owner’s manual,
warranty manual, if applicable,
and zip lock bag or pouch.
Current and Past Models
Service manuals and customer
literature are available for
many current and past model
year GM vehicles.
To order, call 1-800-551-4123
Monday–Friday, 8:00 a.m.–
6:00 p.m. Eastern Time
For credit card orders only
(VISA, MasterCard,
or Discover), see Helm, Inc. at:
www.helminc.com.
To order by mail, write to:
Helm, Incorporated
Attention: Customer Service
47911 Halyard Drive
Plymouth, MI 48170
Make checks payable in U.S.
funds.
Radio Frequency
Statement
This vehicle uses
license-exempt transmitters /
receivers / systems that
operate on a radio frequency
that complies with Part 15/
Part 18 of the Federal
Communications Commission
(FCC) rules and with
Innovation, Science and
Economic Development (ISED)
Canada's license-exempt
RSS(s) / RSP-100 / ICES-GEN.
Operation is subject to the
following two conditions:
1. The device may not cause harmful interference.
2. The device must accept any interference received,
including interference that
may cause undesired
operation of the device.
Changes or modifications to
any of these systems by other
than an authorized service

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/4/22
508 Connected Services
vehicles, Wi-Fi can also be
managed from the Wi-Fi
Hotspot menu.
MyCadillac Mobile App (If
Available)
Download the myCadillac
mobile app to compatible
Apple and Android
smartphones. Cadillac users
can access the following
services from a smartphone:
.Remotely start/stop the
vehicle, if factory-equipped.
.Lock/unlock doors,
if equipped with automatic
locks.
.Activate the horn and lamps.
.Check the vehicle fuel level,
oil life, or tire pressure,
if factory-equipped with the
Tire Pressure Monitor
System.
.Send destinations to the
vehicle.
.Locate the vehicle on a map
(U.S. market only).
.Turn the vehicle's Wi-Fi
hotspot on/off, manage
settings, and monitor data
consumption, if equipped.
.Locate a dealer and
schedule service.
.Request Roadside
Assistance.
.Set a parking reminder with
pin drop, take a photo, make
a note, and set a timer.
.Connect with Cadillac on
social media.
Features are subject to
change. For myCadillac mobile
app information and
compatibility, see
my.cadillac.com.
An active OnStar or
connected service plan may be
required. A compatible device,
factory-installed remote start,
and power locks are required.
Data rates apply. See
www.onstar.com for details
and system limitations.
Remote Services
Contact an OnStar Advisor to
unlock the doors or sound the
horn and flash the lamps.
Marketplace
OnStar Advisors can provide
offers from restaurants and
retailers on your route, help
locate hotels, or book a room.
These services vary by
market.
Diagnostics
By monitoring and reporting
on the vehicle’s key systems,
OnStar Advanced Diagnostics,
if equipped, provides a way to
keep up on maintenance.
Capabilities vary by model. See
www.onstar.com for details
and system limitations.
Features are subject to
change. For updates on
feature capabilities, see
my.cadillac.com. Message and
data rates may apply.

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
514 INDEX
Frequency StatementRadio . . . . . . . . . . . . . . . . . . . . . . . . . . 494
Front Heated and VentilatedSeats . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Pedestrian Braking (FPB) System . . . . . . . . . . . . . 346
Fuel Additives . . . . . . . . . . . . . . . . . . . . . 355
Economy, Driving forBetter . . . . . . . . . . . . . . . . . . . . . . . 234
Filling a Portable Fuel Container . . . . . . . . . . . . . . . . . . 357
Filling the Tank . . . . . . . . . . . . . 356
Foreign Countries . . . . . . . . . 355
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Low Fuel Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Prohibited Fuels . . . . . . . . . . . 355
Recommended . . . . . . 354, 355
Top Tier . . . . . . . . . . . . . . . . . . . . . . 354
Fuses Engine CompartmentFuse Block . . . . . . . . . . . . . . . . . 407
Fuses and Circuit
Breakers . . . . . . . . . . . . . . . . . . . . 406
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . 409 Fuses (cont'd)
Rear Compartment
Fuse Block . . . . . . . . . . . . . . . . . . 411
G
Garage Door Opener . . . . . . . . .141Programming . . . . . . . . . . . . . . . . 141
Gas Strut(s) . . . . . . . . . . . . . . . . . . . 402
Gauges
Engine CoolantTemperature . . . . . . . . . . 114, 115
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Odometer . . . . . . . . . . . . . . . . . . . . . . 112
Speedometer . . . . . . . . . . . . . . . . . 112
Tachometer . . . . . . . . . . . . . . . . . . 113
Trip Odometer . . . . . . . . . . . . . . . 112
Warning Lights and
Indicators . . . . . . . . . . . . . . . . . . . 105
General Information Service andMaintenance . . . . . . . . . . . . . . 467
Towing . . . . . . . . . . . . . . . . . . . . . . . . 358
Vehicle Care . . . . . . . . . . . . . . . . 369
Global Positioning System (GPS) . . . . . . . . . . . . . . . . 183
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . 94 GM Mobility
Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . 487
Guidance Problems with theRoute . . . . . . . . . . . . . . . . . . . . . . . . . 184
H
Halogen Bulbs . . . . . . . . . . . . . . . . 403
Hazard WarningFlashers . . . . . . . . . . . . . . . . . . . . . . . 149
Head Restraints . . . . . . . . . . . . . . . 37
Head-Up Display (HUD) . . . . . 136
Headlamps
Aiming . . . . . . . . . . . . . . . . . . . . . . . . 403
Automatic . . . . . . . . . . . . . . . . . . . . . 148
Bulb Replacement . . . . . . . . . 403
Daytime RunningLamps (DRL) . . . . . . . . . . . . . . . 147
Flash-to-Pass . . . . . . . . . . . . . . . . 147
High Intensity Discharge (HID)
Lighting . . . . . . . . . . . . . . . . . . . . . 403
High-Beam On Light . . . . . . . 128
High/Low Beam Changer . . . . . . . . . . . . . . . . . . . . . 147
Lamps On Reminder . . . . . . . 128

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
516 INDEX
LATCH, Lower Anchorsand Tethers for
Children . . . . . . . . . . . . . . . . . . . . . . . . . 80
LED Lighting . . . . . . . . . . . . . . . . . . 403
Lighting Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Illumination Control . . . . . . . . 150
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403
Lights Airbag Readiness . . . . . . . . . . . 116
Antilock Brake System
(ABS) Warning . . . . . . . . . . . . . . 121
Automatic Emergency Braking (AEB)
Disabled . . . . . . . . . . . . . . . . . . . . . 123
Automatic Vehicle Hold . . . . . . . . . . . . . . . . 122
Brake System Warning . . . . . . . . . . . . . . . . . . . . . 120
Charging System . . . . . . . . . . . . 117
Check Engine
(Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . 118
Cruise Control Light . . . . . . . 128
Door Ajar . . . . . . . . . . . . . . . . . . . . . . 129
Driver Mode Control . . . . . . . 125
Electric Parking Brake . . . . . 121 Lights (cont'd)
Engine Coolant
Temperature
Warning . . . . . . . . . . . . . . . . . . . . . 124
Engine Oil Pressure . . . . . . . . 127
Gauges and Indicators . . . . 105
High-Beam On . . . . . . . . . . . . . . . 128
Lane Keep Assist . . . . . . . . . . . 122
Low Fuel Warning . . . . . . . . . . 127
Performance Shifting . . . . . 122
Seat Belt Reminders . . . . . . 115
Security . . . . . . . . . . . . . . . . . . . . . . . 128
Service Electric Parking Brake . . . . . . . . . . . . . . . 121
StabiliTrak OFF . . . . . . . . . . . . . 124
Tire Pressure . . . . . . . . . . . . . . . . 126
Traction Control System
(TCS)/StabiliTrak . . . . . . . . . . 124
Traction Off . . . . . . . . . . . . . . . . . . 123
Limited-Slip Differential . . . . 301
Locks
Automatic Door . . . . . . . . . . . . . . . 21
Delayed Locking . . . . . . . . . . . . . 20
Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Lockout Protection . . . . . . . . . . 21
Power Door . . . . . . . . . . . . . . . . . . . 20
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Loss of Control . . . . . . . . . . . . . . .237
Low Fuel Warning Light . . . . 127
Low-Profile Tires . . . . . . . . . . . . . 416
Lower Anchors and
Tethers for Children
(LATCH System) . . . . . . . . . . . . . 80
Lumbar Adjustment . . . . . . . . . . 40
Front Seats . . . . . . . . . . . . . . . . . . . 40
M
MaintenanceRecords . . . . . . . . . . . . . . . . . . . . . . . 477
Maintenance Schedule . . . . 469 Recommended Fluidsand Lubricants . . . . . . . . . . . 474
Malfunction Indicator Lamp . . . . . . . . . . . . . . .118
Manual Mode . . . . . . . . . . . . . . . . . . . . 280, 281
Transmission . . . . . . . . . . . . . . . 283
Transmission Fluid . . . . . . . . 382
Map Data Updates . . . . . . . . . . . 184
Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Massage Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Matching
Active Rev . . . . . . . . . . . . . . . . . . . 285

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
518 INDEX
PhoneApple CarPlay and
Android Auto . . . . . . . . . . . . . . 204
Bluetooth . . . . . . . . . . . . . . . 198, 199
Port USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Positioning
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . 183
Power Door Locks . . . . . . . . . . . . . . . . . . . . 20
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Outlets . . . . . . . . . . . . . . . . . . . . . . . . 101
Protection, Battery . . . . . . . . 153
RetainedAccessory (RAP) . . . . . . . . . . 267
Seat Adjustment . . . . . . . . . . . . . 38
Windows . . . . . . . . . . . . . . . . . . . . . . . . 31
Pregnancy, Using Seat Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Privacy Vehicle Data
Recording . . . . . . . . . . . . . . . . . . 496
Problems with Route Guidance . . . . . . . . . . . . . . . . . . . . . . 184
Program
CourtesyTransportation . . . . . . . . . . . 490
Prohibited Fuels . . . . . . . . . . . . . 355 Proposition 65 Warning
California . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Proposition 65 Warning, California . . . 447
Publication Ordering Information . . . . . . . . . . . . . . . . . . 494
R
Radiator . . . . . . . . . . . . . . . . . . . . . . . . 386
RadioAM-FM Radio . . . . . . . . . . . . . . . . 162
Data System (RDS) . . . . . . . . . 164
Frequency Statement . . . . 494
Reception . . . . . . . . . . . . . . . . . . . . . 165
Satellite . . . . . . . . . . . . . . . . . . . . . . . 165
Reading Lamps . . . . . . . . . . . . . . . 150
Rear Cross Traffic Alert(RCTA) System . . . . . . . . . . . . 341
Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Vision Camera (RVC) . . . . . 335
Rearview Mirrors . . . . . . . . . . . . . . . 31 Automatic Dimming . . . . . . . . . . 31
Reclining Seatbacks . . . . . . . . . . 39
Recognition Voice . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Recommended Fuel . . . . . . . . . . . . . . . . . . . . . 354, 355 Recommended Fluids
and Lubricants . . . . . . . . . . . . . 474
Records Maintenance . . . . . . . . . . . . . . . . . 477
Recreational Vehicle Towing . . . . . . . . . . . . . . . . . . . . . . . . 454
Reimbursement
Program, GM Mobility . . . . 487
Remote Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Key Operation . . . . . . . . . . . . . . . . . . 9
Vehicle Start . . . . . . . . . . . . . . . . . . . 16
Replacement Parts Airbags . . . . . . . . . . . . . . . . . . . . . . . . . 72
Maintenance . . . . . . . . . . . . . . . . 475
Replacing
Airbag System . . . . . . . . . . . . . . . 72
LATCH System PartsAfter a Crash . . . . . . . . . . . . . . . 87
Seat Belt System Parts after a Crash . . . . . . . . . . . . . . . . 58
Reporting Safety Defects Canadian Government . . . 495
General Motors . . . . . . . . . . . . 496
U.S. Government . . . . . . . . . . 495
Restraints Where to Put . . . . . . . . . . . . . . . . . 79

Cadillac CT4 Owner Manual (GMNA-Localizing-U.S./Canada-16500442) -
2023 - CRC - 5/10/22
INDEX 519
Retained AccessoryPower (RAP) . . . . . . . . . . . . . . . . .267
Reverse Automatic Braking . . . . . . . . . . . . . . . . . . . . . . . . 340
Reverse Tilt Mirrors . . . . . . . . . . 30
Ride Control Systems Enhanced Traction
System (ETS) . . . . . . . . . . . . . . 301
Roads Driving, Wet . . . . . . . . . . . . . . . . . . 251
Roadside Assistance
Program . . . . . . . . . . . . . . . . . . . . . . 487
Roof Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . 34
Rotation, Tires . . . . . . . . . . . . . . . 429
Routing, Engine Drive Belt . . . . . . . . . . . . . . . . . . . . . 482
Run-Flat Tires . . . . . . . . . . . . . . . . . 415
Running the Vehicle While Parked . . . . . . . . . . . . . . . . .272
S
SafetyLocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Safety Defects Reporting Canadian Government . . . 495
General Motors . . . . . . . . . . . . 496 Safety Defects
Reporting (cont'd)
U.S. Government . . . . . . . . . . 495
Safety System Check . . . . . . . . 57
Satellite Radio . . . . . . . . . . . . . . . . . 165
Scheduling Appointments . . . . . . . . . . . . . . . 490
Sealant Kit, Tire . . . . . . . . . . . . . . 439
Seat Belts . . . . . . . . . . . . . . . . . . . . . . . 49
Buckle To Drive . . . . . . . . . . . . . . 50
Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Extender . . . . . . . . . . . . . . . . . . . . . . . 57
How to Wear SeatBelts Properly . . . . . . . . . . . . . . . 51
Lap-Shoulder Belt . . . . . . . . . . . 54
Reminders . . . . . . . . . . . . . . . . . . . . 115
Replacing after a Crash . . . 58
Use During Pregnancy . . . . . 57
Seats Head Restraints . . . . . . . . . . . . . 37
Heated and Ventilated,Front . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Lumbar Adjustment, Front . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Massage . . . . . . . . . . . . . . . . . . . . . . . . 41
Memory . . . . . . . . . . . . . . . . . . . . . . . . . 41
Power Adjustment, Front . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Seats (cont'd)
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Reclining Seatbacks . . . . . . . . 39
Securing Child Restraints . . . . . . . . . . . . . . . . . 88, 90
Security Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . 501
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Vehicle Alarm . . . . . . . . . . . . . . . . . 24
Self-Sealing Tires . . . . . . . . . . . . 415
Service . . . . . . . . . . . . . . . . . . . . . . . . . . 231 Accessories andModifications . . . . . . . . . . . . . . 370
Doing Your Own Work . . . 370
Electric Parking Brake Light . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Maintenance Records . . . . . 477
Maintenance, General Information . . . . . . . . . . . . . . . . 467
Parts Identification . . . . . . . 479
Scheduling
Appointments . . . . . . . . . . . . . 490
Services Special Application . . . . . . . . 473
Servicing System . . . . . . . . . . . . . 184
Servicing the Airbag . . . . . . . . . . 70
Settings . . . . . . . . . . . . . . . . . . . . . . . . 207